<template>
  <el-dialog :title="title" :visible.sync="dialogFormVisible" width="909px" :before-close="handleClose" :close-on-click-modal="false">
    <div class="upload">
      <el-alert :closable="false" :title="`支持jpg、jpeg、png格式，单次可最多选择${limit}张图片，每张不可大于${size}M，如果大于${size}M会自动为您过滤`" type="info"> </el-alert>
      <br />
      <el-upload
        ref="upload"
        class="upload-content"
        :name="name"
        :data="data"
        :action="action"
        :headers="headers"
        :on-change="handleChange"
        :on-preview="handlePreview"
        :on-remove="handleRemove"
        :on-exceed="handleExceed"
        :on-success="handleSuccess"
        :on-progress="handleProgress"
        :on-error="handleError"
        :file-list="fileList"
        :multiple="true"
        :auto-upload="false"
        accept="image/png, image/jpeg"
        :limit="limit"
        list-type="picture-card"
        :close-on-click-modal="false"
      >
        <i slot="trigger" class="el-icon-plus"></i>
        <el-dialog title="查看大图" append-to-body :visible.sync="dialogVisible">
          <div style="padding-bottom: 20px !important;">
            <img width="100%" :src="dialogImageUrl" alt="" />
          </div>
        </el-dialog>
      </el-upload>
    </div>
    <div slot="footer" class="dialog-footer" style="position: relative; padding-right: 15px; text-align: right;">
      <div v-if="show" style="position: absolute; top: 10px; left: 15px; color: #999;">正在上传中... 当前上传成功数:{{ imgSuccessNum }}张 当前上传失败数:{{ imgErrorNum }}张</div>
      <el-button type="primary" @click="handleClose">关闭</el-button>
      <el-button style="margin-left: 10px;" size="small" type="success" :loading="loading" @click="submitUpload">开始上传 </el-button>
    </div>
  </el-dialog>
</template>

<script>
import { tokenName } from '@/config/settings'

export default {
  name: 'VabUpload',
  props: {
    url: {
      type: String,
      default: '/upload',
      required: true,
    },
    name: {
      type: String,
      default: 'file',
      required: true,
    },
    limit: {
      type: Number,
      default: 50,
      required: true,
    },
    size: {
      type: Number,
      default: 1,
      required: true,
    },
  },
  data() {
    return {
      show: false,
      loading: false,
      dialogVisible: false,
      dialogImageUrl: '',
      action: '',
      headers: {},
      fileList: [],
      picture: 'picture',
      imgNum: 0,
      imgSuccessNum: 0,
      imgErrorNum: 0,
      typeList: null,
      title: '上传',
      dialogFormVisible: false,
      data: {},
    }
  },
  computed: {
    percentage() {
      if (this.allImgNum == 0) return 0
      return this.$baseLodash.round(this.imgNum / this.allImgNum, 2) * 100
    },
  },
  created() {
    if ('development' === process.env.NODE_ENV) {
      this.api = process.env.VUE_APP_BASE_API
    } else {
      this.api = `${window.location.protocol}//${window.location.host}`
    }

    this.action = this.api + this.url
    this.headers[tokenName] = this.$baseAccessToken()
  },
  methods: {
    submitUpload() {
      this.$refs.upload.submit()
    },
    handleProgress(event, file, fileList) {
      this.loading = true
      this.show = true
    },
    handleChange(file, fileList) {
      if (file.size > 1048576 * this.size) {
        fileList.map((item, index) => {
          if (item === file) {
            fileList.splice(index, 1)
          }
        })
        this.fileList = fileList
      } else {
        this.allImgNum = fileList.length
      }
    },
    handleSuccess(response, file, fileList) {
      this.imgNum = this.imgNum + 1
      this.imgSuccessNum = this.imgSuccessNum + 1
      if (fileList.length === this.imgNum) {
        setTimeout(() => {
          this.$emit('fetchDatas')
          this.$baseMessage(`上传完成! 共上传${fileList.length}张图片`, 'success')
        }, 1000)
      }

      setTimeout(() => {
        this.loading = false
        this.show = false
      }, 1000)
    },
    handleError(err, file, fileList) {
      this.imgNum = this.imgNum + 1
      this.imgErrorNum = this.imgErrorNum + 1
      this.$baseMessage(`文件[${file.raw.name}]上传失败,文件大小为${this.$baseLodash.round(file.raw.size / 1024, 0)}KB`, 'error')
      setTimeout(() => {
        this.loading = false
        this.show = false
      }, 1000)
    },
    handleRemove(file, fileList) {
      this.imgNum = this.imgNum - 1
      this.allNum = this.allNum - 1
    },
    handlePreview(file) {
      this.dialogImageUrl = file.url
      this.dialogVisible = true
    },
    handleExceed(files, fileList) {
      this.$baseMessage(
        `当前限制选择 ${this.limit} 个文件，本次选择了
             ${files.length}
             个文件`,
        'error'
      )
    },
    handleShow(data) {
      this.title = '上传'
      this.data = data
      this.dialogFormVisible = true
    },
    handleClose() {
      this.fileList = []
      this.picture = 'picture'
      this.allImgNum = 0
      this.imgNum = 0
      this.imgSuccessNum = 0
      this.imgErrorNum = 0
      if ('development' === process.env.NODE_ENV) {
        this.api = process.env.VUE_APP_BASE_API
      } else {
        this.api = `${window.location.protocol}//${window.location.host}`
      }

      this.action = this.api + this.url
      this.headers[tokenName] = this.$baseAccessToken()
      this.dialogFormVisible = false
    },
  },
}
</script>

<style lang="scss" scoped>
.upload {
  height: 600px;

  .upload-content {
    .el-upload__tip {
      display: block;
      height: 30px;
      line-height: 30px;
    }

    ::v-deep {
      .el-upload--picture-card {
        width: 128px;
        height: 128px;
        margin: 3px 8px 8px 8px;
        border: 2px dashed #c0ccda;
      }

      .el-upload-list--picture {
        margin-bottom: 20px;
      }

      .el-upload-list--picture-card {
        .el-upload-list__item {
          width: 128px;
          height: 128px;
          margin: 3px 8px 8px 8px;
        }
      }
    }
  }
}
</style>
